Okay, I now understand why we actually got that brief reprieve from WWCH ads, but now they're back to stay for the time being.
What happened is that on Friday morning, in preparation for the expected severe weather outbreak, the programming department issued a long-form preemption order for Sunday, meaning that WWCH would not air. However, TWC only has two types of WWCH ads: one that says "Sunday" and one that says "Tomorrow." Since the next episode of WWCH wouldn't be until Monday, neither ad fit the situation, so they had no choice but to fall back on the generic ads, bumpers, and LF openers. Now that it actually is Sunday, the "Tomorrow" ad for WWCH is applicable, so we're getting that shoved down our throats again.